WiFi3 click

WiFi3 click is a complete self-contained WiFi solution carrying the ESP8266 module with a system on a chip. The click is designed to run on a 3.3V power supply only. It communicates with the target board microcontroller through the mikroBUS™ RX, TX, CS and RST lines.

ESP8266 WiFi module

The module supports standard IEEE802.11 b/g/n agreement and has an integrated TCP/IP protocol stack.

It also integrates antenna switches, an RF balun, power amplifier, low noise receive amplifier, power management modes and more.

The Standby power consumption of < 1.0mW is ideally suited for IoT projects and devices that need long battery life.

Ideally suited for IoT applications

WiFi3 click is ideally suited for IoT applications. The System on Chip offloads all the networking functions from the MCU. You can integrate it with sensors and actuators through its GPIOs and connect your things to the internet with minimum development effort.

PCB antenna

WiFi3 click features a PCB trace antenna, designed for the 2400–2483.5 MHz frequency band.

Key features

• PCB trace antenna
• ESP8266 WiFi module
  • 802.11 b/g/n 
  • Integrated low power 32-bit MCU 
  • Integrated 10-bit ADC
  • Integrated TCP/IP protocol stack
  • Wi-Fi 2.4 GHz, support WPA/WPA2
• Interface: RX, TX, CS, RST
• 3.3V power supply

Specification

Pinout diagram

This table shows how the pinout on WiFi3 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin	mikroBUStm				Pin	Notes
Not connected	NC	1	AN	PWM	16	NC	Not connected
Reset module	RST	2	RST	INT	15	NC	Not connected
Enable	EN	3	CS	TX	14	TX	UART Transmit
Not connected	NC	4	SCK	RX	13	RX	UART Receive
Not connected	NC	5	MISO	SCL	12	NC	Not connected
Not connected	NC	6	MOSI	SDA	11	NC	Not connected
Power supply	+3.3V	7	3.3V	5V	10	NC	Not connected
Ground	GND	8	GND	GND	9	GND	Ground

Programming

Code examples for WiFi3 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet shows the interrupt routine for receiving characters from the WiFi3 module.

01 void UART3_Interrupt() iv IVT_INT_USART3 ics ICS_AUTO 
02 {
03     tmp = UART3_Read();
04     switch(tmp) 
05     {
06     case LF:
07         if(data_len > 1)
08         {
09             data_ready = 1;
10         }
11         break;
12     case CR:
13         rx_buff[data_len] = 0;
14         break;
15     default:
16         rx_buff[data_len] = tmp;
17         data_len++;
18     }
19 }

Downloads

 mikroBUS™ Standard specification 

 LibStock: WiFi3 click library 

 WiFi3 click schematic

 ESP8266 datasheet